What Muscles Do Planks Work and How Long Should You Hold a Plank?
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5-Minute Daily Plank Workout
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100 PLANKS: The Plank Encyclopedia for Back Health, Bodyweight Training, and Ultimate Core Strength: Moore, Rob: 9781070322704: Amazon.com: Books
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Dynamic Plank Workout
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ACE - ProSource™: February 2014 - Reality Check: Are Planks Really the Best Core Exercise?
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Ultimate Plank Fitness: For a Strong Core, Killer Abs - and a Killer Body: DeCurtins, Jennifer: 9781592336609: Amazon.com: Books
